{"product_id":"allen-bradley-1746-io12-b-slc-500-combination-i-o-module","title":"Allen-Bradley 1746-IO12\/B SLC 500 Combination I\/O Module","description":"\u003ch1\u003eAllen-Bradley 1746-IO12\/B SLC 500 Combination I\/O Module\u003c\/h1\u003e\n\u003cp\u003eConfigured for mixed digital signal acquisition and relay-based output switching in SLC 500 backplane architecture, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 1746-IO12\/B\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(\u003cstrong\u003e1746-IO12\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eCombination I\/O Module) provides direct physical\/electrical execution of field device interfacing across SLC 500 chassis platforms.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e1746\u003c\/strong\u003e: SLC 500 I\/O platform designation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eIO12\u003c\/strong\u003e: Combination I\/O module with 12 total points (6 inputs + 6 outputs)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\/B\u003c\/strong\u003e: Hardware revision suffix (revision level identifier, no functional breakdown defined in source data)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNo additional structured segmentation is defined in the provided dataset.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003ctable class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003cth class=\"last:pe-10\"\u003eParameter\u003c\/th\u003e\n\u003cth class=\"last:pe-10\"\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e1746-IO12\/B\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUnited States\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e1.00 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eApprox. 2.5 W heat dissipation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInputs\u003c\/td\u003e\n\u003ctd\u003e6 DC inputs (10-30 VDC, sinking)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutputs\u003c\/td\u003e\n\u003ctd\u003e6 relay outputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Voltage Range\u003c\/td\u003e\n\u003ctd\u003e5-265 VAC, 5-125 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Interface\u003c\/td\u003e\n\u003ctd\u003eSLC 500 chassis backplane\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation\u003c\/td\u003e\n\u003ctd\u003eOptical isolation between input and output domains\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSwitching Medium\u003c\/td\u003e\n\u003ctd\u003eElectromechanical relay contacts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eSLC 500 Backplane Communication and I\/O Density Behavior\u003c\/h3\u003e\n\u003cp\u003eThe module integrates into the SLC 500 backplane where cyclic I\/O updates are synchronized through chassis-level scanning. Backplane transaction timing is constrained by slot-based addressing and scan cycle execution. I\/O density scaling is fixed at 12 total points per slot, combining discrete DC sensing and relay actuation within a single module footprint.\u003c\/p\u003e\n\u003cp\u003eFirmware-level behavior is dependent on SLC 500 processor class, with no field-upgradable logic embedded within the module itself. Electrical isolation between input and output sections reduces cross-domain coupling during relay switching events, particularly under inductive load conditions.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions (FAQ)\u003c\/h3\u003e\n\u003cp\u003eQ: Does the 1746-IO12\/B support hot-swap removal in an active SLC 500 chassis?\u003cbr\u003eA: No. Module insertion or removal requires chassis power removal to avoid backplane signal disturbance and potential I\/O state corruption.\u003c\/p\u003e\n\u003cp\u003eQ: What is the backplane current requirement impact per module?\u003cbr\u003eA: The module draws backplane power through the SLC 500 5 VDC bus; system load must account for cumulative chassis current consumption across all installed modules.\u003c\/p\u003e\n\u003cp\u003eQ: Are relay outputs electrically isolated from DC input channels?\u003cbr\u003eA: Yes. Input and output sections are optically isolated, reducing direct electrical coupling between sensing and switching domains.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eThe module must be installed into a powered-down SLC 500 chassis slot with correct alignment to the backplane connector. Terminal blocks should be fully seated to ensure stable contact pressure across all field wiring points.\u003c\/p\u003e\n\u003cp\u003eShielding practices should follow standard industrial control wiring rules. Relay output wiring must be routed separately from low-level DC input lines to reduce switching noise coupling. Inductive loads connected to relay outputs should include suppression elements such as RC snubbers or flyback diodes where applicable.\u003c\/p\u003e\n\u003cp\u003eBackplane connectors must remain free of contamination or mechanical deformation to maintain signal integrity across scan cycles.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43505095114842,"sku":"1746-IO12\/B","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1746-IO121.jpg?v=1781593753","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1746-io12-b-slc-500-combination-i-o-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}